Document template: http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/ceop_metadata.html CEOP Reference Site Data Set Metadata Procedures The documentation (i.e. the "Readme" file) that accompanies each CEOP Reference Site Data Set is as important as the data itself. This information permits collaborators and other analysts to become aware of the data and to understand any limitations or special characteristics of data that may impact its use elsewhere. The data set documentation should accompany all data set submissions and contain the information listed in the outline below. The following outline (and content) should be adhered to as closely as possible to make the documentation consistent across all data sets. A documentation file submission must accompany each submitted data set. TITLE: BALTEX_Sodankyla_ObservatorSiteA_20021001-20041231.sfc CONTACT(S): Name(s) of PI and all co-Pis Bengt Tammelin, Reijo Hyvönen Complete mailing address, telephone/facsimile Nos., Finnish Meteorological Institute Meteorological Research P.O. BOX 503 (Street address: Vuorikatu 24) FIN-00101 Helsinki FINLAND phone: +358-9-1929 4160 (BT), +358-9-1929 4161 (RH) E-mail address of PIs, and WWW address (if applicable) Bengt.Tammelin@fmi.fi, Reijo.Hyvonen@fmi.fi http://www.fmi.fi Similar contact information for data questions (if different than above) Finnish Meteorological Institute Observations Branch Sahaajankatu 20E FIN-00880 Helsinki FINLAND email Jani.Poutiainen@fmi.fi phone +358-9-1929 5759 1.0 DATA SET OVERVIEW: Introduction or abstract Data file is compiled for the CEOP EOP-3 and EOP-4 measurement period. See CEOP web-site for project background: http://monsoon.t.u-tokyo.ac.jp/ceop/index.html Time period covered by the data 01.10.2003-30.9.2003 Physical location (including lat/lon/elev) of the measurement or platform Data are measured at Sodankyla Arctic Research Centre's Observatory (Sodankyla Site A): Coordinates (WGS-84) lat: 67 22' 00,0" lon: 26 37' 44,6" elev: 179,2 m a.s.l, (global radiation measurement is made in tower at 193,3 m height a.s.l) Data source if applicable (e.g. for operational data include agency) Operational data (i.e. whole data set): Finnish Meteorological Institute. Any World Wide Web address references (i.e. additional documentation such as Project WWW site) http://fmiarc.fmi.fi/ 2.0 INSTRUMENTATION DESCRIPTION: Description of instrumention (make, model and height above ground) Station pressure: Vaisala PTB220B, 1m Air temperature: PT100 element, 2m Dew point temperature: calculated (FMI) Relative humidity: Vaisala HMP35D, 2m Specific humidity: calculated (Bolton 1980; http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/eqns.html) Wind speed: Vaisala WAA-25, 22m Wind direction: Vaisala WAV-15, 22m U wind component: calculated (GEMPAK; http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/eqns.html) V wind component: calculated (GEMPAK; http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/eqns.html) Precipitation: H&H -90 gauge, 1.5m Snow depth: snow stick, 0m Incoming shortwave: Kipp & Zonen CM11, 14m Outgoing shortwave: Kipp & Zonen CM11, 2m Figures (or links), if applicable Instrumentation specifications (e.g. accuracy, precision, frequency, resolution, etc.) 3.0 DATA COLLECTION AND PROCESSING: Description of data collection Precipitation and snow depth measurements are done manually, and included in synop messages. All other except radiation values are logged with Vaisala Milos 500 weather station. Radiation measurements are made with a PC equipped with data acquisition board. All data is collected via leased network connection to FMI data center. These data are in the CEOP EOP-3 data format agreed to by the CEOP Scientific Steering Committee. This format is described in detail as part of the CEOP Reference Site Data Set Procedures Report which is available at the following URL: http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/ceop_sfc_met_format.html Description of derived parameters and processing techniques used See: 2.0 INSTRUMENTATION DESCRIPTION 4.0 QUALITY CONTROL PROCEDURES Description of quality control procedures Standard FMI quality control, and additional complete visual checking. 5.0 GAP FILLING PROCEDURES Description of gap filling procedures No gap filling applied. 6.0 DATA REMARKS: PI's assessment of the data (i.e. disclaimers, instrument problems, quality issues, etc.) Data is classified as category 1 with reference to CEOP data classification. Station pressure, air temparature, and all humidity and wind parameters are values measured at full hours. Precipitation (mm) is recorded every 12 hours at 06 and 18 utc. Precipitation value "-1.00" indicates no rain while "0.00" refers to less than 0.05 mm of rain. Snow depth is given daily at 06 utc. Snow depth (cm) value "-1.00" indicates no snow while "0.00" refers to less than 0.5 cm of snow. 6.1 Times of radiation parameters Times in the surface data file are expressed as UTC time, except for radiation values. The latter are referred to true solar time in our database (ie. current data source), as advised by WMO 1996: Guide to meteorological instruments and methods of observation. By knowing station location, the user may further convert true solar time to UTC, although corresponding UTC time is not likely to be exact full hour. Missing data periods Flagged with "M" (see: http://www.joss.ucar.edu/ghp/ceopdm/refdata_report/data_flag_definitions.html), corresponding data marked as "-999.99". Data intercomparisons, if applicable 7.0 REFERENCE REQUIREMENTS: Specify how you require your data to be referenced. Finnish Meteorological Institute must be stated as data source when the data are used. 8.0 REFERENCES: List of documents cited in this data set description WMO, 1996: Guide to meteorological instruments and methods of observation, sixth edition.